公开(公告)号：US20150117072A1

公开(公告)日：2015-04-30

申请号：US14526187

申请日：2014-10-28

Applicant: Richtek Technology Corp.

Inventor： Tong-Cheng Jao ,  Yi-Wei Lee ,  Isaac Y. Chen

IPC: H02M3/335

CPC classification number: H02M1/36 ,  H02M3/33507 ,  H02M3/33523 ,  H02M3/33553

Abstract: A soft-start switching power converter includes a voltage converting circuit and a soft-start circuit. The voltage converting circuit includes a transformer, and a first switch which includes a first terminal connected to the transformer, a second terminal providing a trigger signal, and a control terminal receiving a control signal, and which is controlled to switch between conduction and nonconduction, such that the transformer generates a feedback voltage. The soft-start circuit receives the trigger signal, generates the control signal according to the trigger signal, and determines whether or not to clamp the control signal at a preset voltage level based on the trigger signal.

Abstract translation: 软启动开关电源转换器包括电压转换电路和软启动电路。 电压转换电路包括变压器和第一开关，其包括连接到变压器的第一端子，提供触发信号的第二端子和接收控制信号的控制端子，并且被控制为在导通和非导通之间切换， 使得变压器产生反馈电压。 软启动电路接收触发信号，根据触发信号产生控制信号，并根据触发信号确定是否将控制信号钳位在预设电压电平。

公开(公告)号：US20150048750A1

公开(公告)日：2015-02-19

申请号：US14334574

申请日：2014-07-17

Applicant: RICHTEK TECHNOLOGY CORP.

Inventor： Tong-Cheng JAO ,  Yi-Wei LEE ,  Isaac Y. CHEN

IPC: H05B33/08 ,  H02M7/217

CPC classification number: H05B33/0815 ,  H02M7/2176 ,  H02M2001/0045 ,  H05B33/0812 ,  Y02B20/343 ,  Y02B20/345 ,  Y02B20/346 ,  Y02B20/347

Abstract: A light emitting system includes a series connection of a light emitting unit and a variable current source, and a voltage conversion device that includes a rectifier circuit and an output circuit. The rectifier circuit rectifies an AC voltage to generate a rectified voltage across a first rectifier output coupled to one end of the series connection of the light emitting unit and the variable current source, and a second rectifier output. The output circuit is coupled between the second rectifier output and another end of the series connection of the light emitting unit and the variable current source, and is configured to generate a direct-current (DC) output voltage.

Abstract translation: 发光系统包括发光单元和可变电流源的串联连接，以及包括整流电路和输出电路的电压转换装置。 整流电路对AC电压进行整流，以在耦合到发光单元和可变电流源的串联连接的一端的第一整流器输出和第二整流器输出之间产生整流电压。 输出电路耦合在第二整流器输出和发光单元与可变电流源的串联连接的另一端之间，并被配置为产生直流（DC）输出电压。

公开(公告)号：US08917806B1

公开(公告)日：2014-12-23

申请号：US14256031

申请日：2014-04-18

Applicant: Richtek Technology Corp

Inventor： Yen-Yin Huang ,  Kuo-Shih Tsai ,  Ming-Shih Yu

IPC: H03D3/24 ,  H04L7/033

CPC classification number: H04L7/0331 ,  H03L2207/50

Abstract: A phase/frequency detector module, applicable to a digital phase-locked loop, includes: an edge detector for receiving a reference clock signal and a counting clock signal, where when a positive edge of the counting clock signal occurs, if a positive edge of the reference clock signal has occurred, the edge detector outputs an edge-detected signal, else the edge detector outputs an edge-not-detected signal; a counter coupled to the edge detector, where if receiving the edge-detected signal, the counter outputs a counting result forming a frequency error signal, resets, and loads a count value, and if receiving the edge-not-detected signal, the counter continues to count on the positive edge of the counting clock signal; and a frequency phase converter for performing integration over the counting result, where the integral forms a phase error signal.

Abstract translation: 适用于数字锁相环的相位/频率检测器模块包括：边缘检测器，用于接收参考时钟信号和计数时钟信号，其中当计数时钟信号的上升沿出现时，如果 参考时钟信号发生，边缘检测器输出边沿检测信号，否则边沿检测器输出未检测到边沿的信号; 耦合到边缘检测器的计数器，其中如果接收到边沿检测信号，则计数器输出形成频率误差信号的计数结果，复位并加载计数值，并且如果接收到未被检测的边缘信号，则计数器 继续依靠计数时钟信号的上升沿; 以及用于对计数结果执行积分的频率相位转换器，其中积分形成相位误差信号。

公开(公告)号：US20140320041A1

公开(公告)日：2014-10-30

申请号：US13973681

申请日：2013-08-22

Applicant: RICHTEK TECHNOLOGY CORP.

Inventor： Chien-Hua Lin ,  Shui-Mu Lin

IPC: H05B33/08

CPC classification number: H05B33/0842

Abstract: A light emitting diode driver includes: a serial-to-parallel conversion unit converting, based on a reference clock signal, a serial input signal carrying a number (N) of M-bit gray codes into a parallel input signal carrying the M-bit gray codes; a counting unit counting an output control signal to output a counting value; a data buffer unit storing, based on a latch signal, the M-bit gray codes carried by the parallel input signal, and outputting, based on the counting value and the M-bit gray codes, an N-bit signal consisting of N bits, each of which is an ith one of M bits of a respective M-bit gray code, where i is associated with the counting value; and an output unit generating a number (N) of driving current signals based on at least the N-bit signal.

Abstract translation: 发光二极管驱动器包括：串行到并行转换单元，将基于参考时钟信号的携带M位灰度代码的（N）个M位的串行输入信号转换为携带M位的并行输入信号 灰色代码; 计数单元，对输出控制信号进行计数以输出计数值; 数据缓冲器单元，基于锁存信号存储并行输入信号所携带的M位灰色代码，并根据计数值和M位灰度代码输出由N位组成的N位信号 ，其中每个是相应M位灰度码的M位中的第i个，其中i与计数值相关联; 以及输出单元，至少基于N位信号生成数量（N）个驱动电流信号。

公开(公告)号：US20130229833A1

公开(公告)日：2013-09-05

申请号：US13865524

申请日：2013-04-18

Applicant: RICHTEK TECHNOLOGY CORP.

Inventor： Liang-Pin TAI ,  Tzu-Chen LIN ,  Cheng-Hsuan FAN

IPC: H02M3/335

CPC classification number: H02M3/33523

Abstract: A feedback circuit for an isolated power converter includes an opto-coupler and a reversed polarity regulator. The opto-coupler provides a current related to an output voltage of the isolated power converter. When the isolated power converter enters light load, the output voltage rises and the reversed polarity regulator reduces the current to decrease the power consumption and thus improve the light load efficiency of the isolated power converter.

Abstract translation: 用于隔离电力转换器的反馈电路包括光耦合器和反极性调节器。 光耦合器提供与隔离功率转换器的输出电压相关的电流。 当隔离电源转换器进入轻负载时，输出电压升高，反极性调节器降低电流以降低功耗，从而提高隔离电源转换器的轻负载效率。